4、这条狗你养了多久了?Exercise1. My brother has been a tour guide for two years. (就划线部分提问)_______________________________ your brother been a tour guide?2.—______you___yourhomeworkyet?—Yes.I_____itamomentago.A.Did;do;finishedB.Have;done;finishedC.Have;done;havefinishedD.will;do;finish注意,在表示某一